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coredump: fix dumping through pipes 

The offset in the core file used to be tracked with ->written field of
the coredump_params structure. The field was retired in favour of
file->f_pos.

However, ->f_pos is not maintained for pipes which leads to breakage.

Restore explicit tracking of the offset in coredump_params. Introduce
->pos field for this purpose since ->written was already reused.

Fixes: a008393951 ("get rid of coredump_params->written").

Reported-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Signed-off-by: Mateusz Guzik <mguzik@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Mateusz Guzik 2016-06-05 23:14:14 +02:00 committed by Al Viro
parent a01e718f72
commit 1607f09c22
5 changed files with 7 additions and 4 deletions
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2
arch/powerpc/platforms/cell/spufs/coredump.c
View File

@ -172,7 +172,7 @@ static int spufs_arch_write_note(struct spu_context *ctx, int i,
if (rc < 0)
goto out;
skip = roundup(cprm->file->f_pos - total + sz, 4) - cprm->file->f_pos;
skip = roundup(cprm->pos - total + sz, 4) - cprm->pos;
if (!dump_skip(cprm, skip))
goto Eio;
out:

2
fs/binfmt_elf.c
View File

@ -2275,7 +2275,7 @@ static int elf_core_dump(struct coredump_params *cprm)
goto end_coredump;
/* Align to page */
if (!dump_skip(cprm, dataoff - cprm->file->f_pos))
if (!dump_skip(cprm, dataoff - cprm->pos))
goto end_coredump;
for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;

2
fs/binfmt_elf_fdpic.c
View File

@ -1787,7 +1787,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
}
if (!dump_skip(cprm, dataoff - cprm->file->f_pos))
if (!dump_skip(cprm, dataoff - cprm->pos))
goto end_coredump;
if (!elf_fdpic_dump_segments(cprm))

4
fs/coredump.c
View File

@ -794,6 +794,7 @@ int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
return 0;
file->f_pos = pos;
cprm->written += n;
cprm->pos += n;
nr -= n;
}
return 1;
@ -808,6 +809,7 @@ int dump_skip(struct coredump_params *cprm, size_t nr)
if (dump_interrupted() ||
file->f_op->llseek(file, nr, SEEK_CUR) < 0)
return 0;
cprm->pos += nr;
return 1;
} else {
while (nr > PAGE_SIZE) {
@ -822,7 +824,7 @@ EXPORT_SYMBOL(dump_skip);
int dump_align(struct coredump_params *cprm, int align)
{
unsigned mod = cprm->file->f_pos & (align - 1);
unsigned mod = cprm->pos & (align - 1);
if (align & (align - 1))
return 0;
return mod ? dump_skip(cprm, align - mod) : 1;

1
include/linux/binfmts.h
View File

@ -65,6 +65,7 @@ struct coredump_params {
unsigned long limit;
unsigned long mm_flags;
loff_t written;
loff_t pos;
};
/*